I have a cylindrical surface that I imported from a Parasolid file. Why does
Simulation 8.1 not allow a bolt pretension section for the cylindrical surface?

Simulation requires a true cylindrical surface when creating a pretension section.
Although your CAD geometry may look like it has a cylindrical surface, it may
actually consist of a NURB surface instead. If the surface is a true cylindrical
surface, it will show up as a "cylinder" when selected. However, it will just show
up as a "face" if it is not a true cylindrical surface. As a workaround, you can
re-create the cylinder in DesignModeler.

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